use simpler gradient factories (in prep for removing SkUnitMapper param)

ui/views/controls/progress_bar.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/progress_bar.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 63 matching lines @@
   paint.setFlags(SkPaint::kAntiAlias_Flag);
 
   SkPoint p[2];
   p[0].iset(x, y);
   if (gradient_horizontal) {
     p[1].iset(x + w, y);
   } else {
     p[1].iset(x, y + h);
   }
   skia::RefPtr<SkShader> s = skia::AdoptRef(SkGradientShader::CreateLinear(
-      p, colors, points, count, SkShader::kClamp_TileMode, NULL));
+      p, colors, points, count, SkShader::kClamp_TileMode));
   paint.setShader(s.get());
 
   canvas->DrawPath(path, paint);
 }
 
 void FillRoundRect(gfx::Canvas* canvas,
                    int x, int y,
                    int w, int h,
                    int corner_radius,
                    SkColor gradient_start_color,
@@ skipping 198 matching lines @@
         paint.setFlags(SkPaint::kAntiAlias_Flag);
 
         SkPoint p[2];
         int highlight_left =
             std::max(0, progress_width - kHighlightWidth - kBorderWidth);
         p[0].iset(highlight_left, 0);
         p[1].iset(progress_width, 0);
         skia::RefPtr<SkShader> s =
             skia::AdoptRef(SkGradientShader::CreateLinear(
                 p, highlight_colors, highlight_points,
-                arraysize(highlight_colors), SkShader::kClamp_TileMode, NULL));
+                arraysize(highlight_colors), SkShader::kClamp_TileMode));
         paint.setShader(s.get());
         paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
         canvas->DrawRect(gfx::Rect(highlight_left, 0,
                                    kHighlightWidth + kBorderWidth, bar_height),
                          paint);
       }
 
       canvas->Restore();
     }
 
     // Draw bar stroke
     StrokeRoundRect(canvas,
                     bar_left, bar_top, progress_width, bar_height,
                     kCornerRadius,
                     enabled() ? kBarBorderColor : kDisabledBarBorderColor,
                     kBorderWidth);
   }
 }
 
 }  // namespace views